CARBON DIOXIDE RECOVERY METHOD

摘要

PROBLEM TO BE SOLVED: To provide a method for efficiently recovering carbon dioxide, which comprises causing carbon dioxide in combustion exhaust to be efficiently absorbed by a calcium-containing compound with high CO2absorption property to give calcium carbonate and thus recovering carbon dioxide.

SOLUTION: The carbon dioxide recovery method comprises causing carbon dioxide in combustion exhaust to be effectively absorbed by a calcium-containing compound with high CO2absorption property to give calcium carbonate and thus recovering carbon dioxide in the form of calcium carbonate. Ca(OH)2obtained by reacting CaO with water or water vapor is further heated for dehydration to generate CO2. The thus generated CO2is allowed to coexist with carbon dioxide in combustion exhaust under conditions of a temperature between room temperature and 800°C and a pressure of 30 atmospheres to give calcium carbonate, thereby recovering carbon dioxide. Furthermore, CaCO3removed from the combustion exhaust is decomposed to generate CaO. The CaO is then caused to react with water or water vapor for conversion of CaO into Ca(OH)2. The Ca(OH)2is then heated for dehydration for conversion of the Ca(OH)2into CaO. The thus obtained CaO is returned into the combustion exhaust.

COPYRIGHT: (C)2006,JPO&NCIPI